title: Long-range magnetic ordering in bulk Tb1-xMxMnO₃ (M = Ca, Sr).
abstract: Substitution of Ca(2+) and Sr(2+) at the A-site of multiferroic TbMnO3 bulk results in an increased average ionic radius and ionic-size mismatch, and was found to reduce the orthorhombic distortion. Signatures of long-range ferromagnetic-like ordering at 78 K in Tb0.67Ca0.33MnO3 and at 87 K in Tb0.67Sr0.33MnO3 samples are clearly observed in both the dc and ac susceptibility data. A compensation temperature is also observed in Tb0.67Ca0.33MnO3, indicating the antiparallel alignment of Tb(3+) moments to the Mn(3+)-Mn(4+) moments. The canted antiferromagnetic ordering coexists with antiferromagnetic clusters, resulting in spin-glass-like behavior at low temperatures. An increased average ionic radius and ionic-size mismatch at the A-site are determined to be critical factors in determining the magnetic properties of the hole-doped manganites.
authors.affiliation: Department of Physics, University of Connecticut, Storrs, CT 06269, USA.
authors.forename: M
authors.initials: M
authors.lastname: Staruch
authors.forename: M
authors.initials: M
authors.lastname: Jain
mesh_terms: D000863:Antacids / Q000737:chemistry; D002118:Calcium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D008277:Magnesium Oxide / Q000737:chemistry*; D008280:Magnetics; D059346:Magnets / Q000737:chemistry*; D013324:Strontium / Q000737:chemistry*; D013696:Temperature; D013725:Terbium / Q000737:chemistry*
chemical_list: D000863:Antacids; D013725:Terbium; D008277:Magnesium Oxide; D002118:Calcium; D013324:Strontium